TLS induced decoherence instabilities in superconducting qubits

ORAL

Abstract

We study the temporal stability of relaxation and dephasing in superconducting transmon qubits. By collecting statistics during measurements spanning multiple days, we reveal large fluctuations of qubit lifetimes and find that the main cause of T1 fluctuations is interacting parasitic two-level-systems (TLS). Our statistical analysis also provides useful information about dynamics of TLS which could help identify possible microscopic sources of TLS, which still remain elusive. Moreover, interacting TLS also cause capacitance fluctuations, ultimately leading to frequency noise and dephasing of the qubit state. These discoveries are important for manufacturing stable superconducting circuits suitable as a scalable quantum computing platform where drift and fluctuations lead to unnecessary calibration and downtime.

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Presenters

  • Andreas Bengtsson

    • Chalmers University of Technology
    • Microtechnology and Nanoscience, MC2, Chalmers University of Technology

Authors

  • Andreas Bengtsson

    • Chalmers University of Technology
    • Microtechnology and Nanoscience, MC2, Chalmers University of Technology

  • Jonathan Burnett

    • Chalmers University of Technology
    • Microtechnology and Nanoscience, MC2, Chalmers University of Technology

  • Marco Scigliuzzo

    • Chalmers University of Technology
    • Microtechnology and Nanoscience, MC2, Chalmers University of Technology

  • David Niepce

    • Chalmers University of Technology

  • Marina Kudra

    • Chalmers University of Technology

  • Per Delsing

    • Microtechnology and Nanoscience MC2, Chalmers University of Technology
    • Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology
    • Chalmers University of Technology
    • Microtechnology and Nanoscience, MC2, Chalmers University of Technology

  • Jonas Bylander

    • Chalmers University of Technology